Theo van Doesburg was a Dutch artist, architect, and designer, born on August 30, 1883. He is best known as the founder of the De Stijl movement, which emphasized abstraction and simplicity in art and design. Van Doesburg's work often featured geometric shapes and primary colors, aiming to create harmony and balance. In addition to painting, van Doesburg was involved in architecture and typography, influencing various fields of modern design. He collaborated with other notable artists, including Piet Mondrian, and contributed to the development of modernist principles in Europe. Van Doesburg passed away on March 7, 1931, leaving a lasting legacy in the art world.